Hello everyone,
This is the second batch of btrfs updates for the merge window, which
includes an assortment of optimizations, fixes, cleanups and small
features.
>From a performance point of view, synchronous writes get a big boost by
making sure we unplug instead of letting kblockd do it for us, and Josef
got rid of two more mutexes from the allocator.
mount -o ssd is much faster in multi-process workloads, and it does a
better job of preventing free space fragmentation as well.
Linus, you'll find these changes in the master branch of:
git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable.git
Amit Gud (1):
Btrfs: fix race in worker_loop
Chris Mason (5):
Btrfs: keep processing bios for a given bdev if our proc is batching
Btrfs: unplug in the async bio submission threads
Btrfs: break up btrfs_search_slot into smaller pieces
Btrfs: Optimize locking in btrfs_next_leaf()
Btrfs: rework allocation clustering
Dan Carpenter (2):
Btrfs: remove dead code
Btrfs: remove dead code
Eric Paris (1):
Btrfs: introduce btrfs_show_options
Heiko Carstens (1):
Btrfs: fix __ucmpdi2 compile bug on 32 bit builds
Jim Owens (1):
Btrfs: remove unused ftrace include
Josef Bacik (4):
Btrfs: free space cache cleanups
Btrfs: clean up find_free_extent
Btrfs: kill the block group alloc mutex
Btrfs: kill the pinned_mutex
Sage Weil (2):
Btrfs: notreelog mount option
Btrfs: add flushoncommit mount option
Shen Feng (1):
Btrfs: free inode struct when btrfs_new_inode fails
Stoyan Gaydarov (1):
Btrfs: BUG to BUG_ON changes
Wu Fengguang (1):
Btrfs: fix typos in comments
fs/btrfs/async-thread.c | 7
fs/btrfs/ctree.c | 312 ++++++++++++++++---------
fs/btrfs/ctree.h | 84 ++++--
fs/btrfs/delayed-ref.c | 1
fs/btrfs/disk-io.c | 8
fs/btrfs/extent-tree.c | 398 ++++++++++++++++-----------------
fs/btrfs/extent_io.c | 16 -
fs/btrfs/extent_map.c | 1
fs/btrfs/free-space-cache.c | 530 +++++++++++++++++++++++++++++++-------------
fs/btrfs/free-space-cache.h | 44 +++
fs/btrfs/inode.c | 5
fs/btrfs/locking.c | 4
fs/btrfs/super.c | 54 ++++
fs/btrfs/transaction.c | 7
fs/btrfs/tree-log.c | 12
fs/btrfs/volumes.c | 41 +++
fs/btrfs/volumes.h | 2
17 files changed, 982 insertions(+), 544 deletions(-)
On Friday 03 April 2009 15:32:58 Chris Mason wrote:
> Hello everyone,
>
> This is the second batch of btrfs updates for the merge window, which
> includes an assortment of optimizations, fixes, cleanups and small
> features.
>
> >From a performance point of view, synchronous writes get a big boost by
> making sure we unplug instead of letting kblockd do it for us, and Josef
> got rid of two more mutexes from the allocator.
>
> mount -o ssd is much faster in multi-process workloads, and it does a
> better job of preventing free space fragmentation as well.
>
> Linus, you'll find these changes in the master branch of:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable.git
>
> Amit Gud (1):
> Btrfs: fix race in worker_loop
>
> Chris Mason (5):
> Btrfs: keep processing bios for a given bdev if our proc is batching
> Btrfs: unplug in the async bio submission threads
> Btrfs: break up btrfs_search_slot into smaller pieces
> Btrfs: Optimize locking in btrfs_next_leaf()
> Btrfs: rework allocation clustering
>
> Dan Carpenter (2):
> Btrfs: remove dead code
> Btrfs: remove dead code
>
> Eric Paris (1):
> Btrfs: introduce btrfs_show_options
>
> Heiko Carstens (1):
> Btrfs: fix __ucmpdi2 compile bug on 32 bit builds
>
> Jim Owens (1):
> Btrfs: remove unused ftrace include
>
> Josef Bacik (4):
> Btrfs: free space cache cleanups
> Btrfs: clean up find_free_extent
> Btrfs: kill the block group alloc mutex
> Btrfs: kill the pinned_mutex
>
> Sage Weil (2):
> Btrfs: notreelog mount option
> Btrfs: add flushoncommit mount option
>
> Shen Feng (1):
> Btrfs: free inode struct when btrfs_new_inode fails
>
> Stoyan Gaydarov (1):
> Btrfs: BUG to BUG_ON changes
>
> Wu Fengguang (1):
> Btrfs: fix typos in comments
>
> fs/btrfs/async-thread.c | 7
> fs/btrfs/ctree.c | 312 ++++++++++++++++---------
> fs/btrfs/ctree.h | 84 ++++--
> fs/btrfs/delayed-ref.c | 1
> fs/btrfs/disk-io.c | 8
> fs/btrfs/extent-tree.c | 398 ++++++++++++++++-----------------
> fs/btrfs/extent_io.c | 16 -
> fs/btrfs/extent_map.c | 1
> fs/btrfs/free-space-cache.c | 530 +++++++++++++++++++++++++++++++-------------
> fs/btrfs/free-space-cache.h | 44 +++
> fs/btrfs/inode.c | 5
> fs/btrfs/locking.c | 4
> fs/btrfs/super.c | 54 ++++
> fs/btrfs/transaction.c | 7
> fs/btrfs/tree-log.c | 12
> fs/btrfs/volumes.c | 41 +++
> fs/btrfs/volumes.h | 2
> 17 files changed, 982 insertions(+), 544 deletions(-)
Chris,
Just go the following gpf during shutdown runing 2.6.30-rc1 on amd64 on a kernel built with gcc 4.3.3
* Unmounting filesystems ...[75813.573941] EXT4-fs: mballoc: 313285 blocks 3098 reqs (2001 success)
[75813.593628] EXT4-fs: mballoc: 1312 extents scanned, 438 goal hits, 1063 2^N hits, 0 breaks, 0 lost
[75813.621386] EXT4-fs: mballoc: 1551 generated and it took 21437865
[75813.640246] EXT4-fs: mballoc: 364104 preallocated, 204441 discarded
[75813.685443] general protection fault: 0000 [#1] PREEMPT SMP
[75813.698277] last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/enable
[75813.698277] CPU 1
[75813.698277] Modules linked in: btrfs/etc/init.d/halt zlib_deflate zlib_inflate crc32c libcrc32c radeon drm bridge stp llc bnep rf]
.sh: line 90: 6[75813.698277] Pid: 6768, comm: umount Not tainted 2.6.30-rc1-crc #1 System Product Name
768 Segmentation[75813.698277] RIP: 0010:[<ffffffff8030e3a7>] [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
fault umou[75813.698277] RSP: 0018:ffff8801466514a8 EFLAGS: 00010046
nt "${x}" >&/dev[75813.698277] RAX: 0000000000000000 RBX: ffff880028066b40 RCX: ffff88015f3444a0
/null
[75813.698277] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80847330
[75813.698277] RBP: ffff8801466514e8 R08: 00000035c2309000 R09: 0000000000000002
[75813.698277] R10: 0000000000001000 R11: 0000000000000001 R12: ff880153891480ff
[75813.698277] R13: 0000000000000246 R14: ffffffff8088ca58 R15: 0000000000000080
[75813.698277] FS: 00007f6dd9cc0740(0000) GS:ffff880028059000(0000) knlGS:0000000000000000
[75813.698277] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[75813.698277] CR2: 00007f6dd964e000 CR3: 00000001425fd000 CR4: 00000000000006e0
[75813.698277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[75813.698277] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[75813.698277] Process umount (pid: 6768, threadinfo ffff880146650000, task ffff88015f3444a0)
[75813.698277] Stack:
[75813.698277] 0000005000e7f0b0 0000000000e7f0b0 0000000000e7f0b0 0000000000000000
[75813.698277] 0000000000000060 0000000000000051 ffff88013cd073c0 ffff88013cd078a0
[75813.698277] ffff8801466515a8 ffffffffa04e1365 000000000000be2d 0000000000000000
[75813.698277] Call Trace:
[75813.698277] [<ffffffffa04e1365>] btrfs_update_delayed_ref+0x245/0x490 [btrfs]
[75813.698277] [<ffffffff8043a8e0>] ? sort+0x160/0x250
[75813.698277] [<ffffffffa048befc>] __btrfs_update_extent_ref+0x6c/0xb0 [btrfs]
[75813.698277] [<ffffffff80610f94>] ? _cond_resched+0x44/0xa0
[75813.698277] [<ffffffffa0491ab3>] btrfs_inc_ref+0x6c3/0x7d0 [btrfs][75813.698277] [<ffffffffa048e7bc>] ? btrfs_init_new_buffer+0x11c/0x180 [btrfs]
[75813.698277] [<ffffffffa04c7b84>] ? write_extent_buffer+0x114/0x330 [btrfs]
[75813.698277] [<ffffffffa048be90>] ? __btrfs_update_extent_ref+0x0/0xb0 [btrfs]
[75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
[75813.698277] [<ffffffffa04815fa>] __btrfs_cow_block+0x58a/0xbc0 [btrfs]
[75813.698277] [<ffffffffa0481d39>] btrfs_cow_block+0x109/0x270 [btrfs]
[75813.698277] [<ffffffffa04877f2>] btrfs_search_slot+0x202/0x880 [btrfs]
[75813.698277] [<ffffffffa048a458>] lookup_extent_backref+0x68/0x160 [btrfs]
[75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
[75813.698277] [<ffffffffa048c91d>] __btrfs_free_extent+0x18d/0x950 [btrfs]
[75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
[75813.698277] [<ffffffff80618191>] ? add_preempt_count+0x61/0x70
[75813.698277] [<ffffffffa048d35d>] run_one_delayed_ref+0x27d/0x2c0 [btrfs]
[75813.698277] [<ffffffffa048e8f6>] run_clustered_refs+0xd6/0x250 [btrfs]
[75813.698277] [<ffffffffa048eb46>] btrfs_run_delayed_refs+0xd6/0x2b0 [btrfs]
[75813.698277] [<ffffffffa04a4244>] btrfs_commit_tree_roots+0xb4/0x2f0 [btrfs]
[75813.698277] [<ffffffffa04a4e0b>] btrfs_commit_transaction+0x5cb/0xa00 [btrfs]
[75813.698277] [<ffffffff802724d0>] ? autoremove_wake_function+0x0/0x70
[75813.698277] [<ffffffffa04a3315>] ? start_transaction+0x125/0x170 [btrfs]
[75813.698277] [<ffffffffa047cd66>] btrfs_sync_fs+0x66/0xb0 [btrfs]
[75813.698277] [<ffffffff803177a6>] __fsync_super+0x66/0xa0
[75813.698277] [<ffffffff80317805>] fsync_super+0x25/0x50
[75813.698277] [<ffffffff80317a7e>] generic_shutdown_super+0x3e/0x170
[75813.698277] [<ffffffff80317c55>] kill_anon_super+0x25/0x70
[75813.698277] [<ffffffff80318189>] deactivate_super+0x69/0xa0
[75813.698277] [<ffffffff8033502c>] mntput_no_expire+0x1ac/0x1e0
[75813.698277] [<ffffffff80335466>] sys_umount+0x76/0x3e0
[75813.698277] [<ffffffff8020bf9b>] system_call_fastpath+0x16/0x1b
[75813.698277] Code: 8b 9c c6 e8 00 00 00 48 83 3b 00 44 8b 7b 18 0f 84 77 01 00 00 31 d2 31 f6 48 c7 c7 30 73 84 80 e8 ff 2d fb ff
[75813.698277] RIP [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
[75813.698277] RSP <ffff8801466514a8>
[75813.698277] ---[ end trace a92f79fb0023c3c1 ]---
Followed by many more...
Hope this helps,
Ed Tomlinson
On Wed, 2009-04-08 at 19:48 -0400, Ed Tomlinson wrote:
>
> Chris,
>
> Just go the following gpf during shutdown runing 2.6.30-rc1 on amd64 on a kernel built with gcc 4.3.3
>
> * Unmounting filesystems ...[75813.573941] EXT4-fs: mballoc: 313285 blocks 3098 reqs (2001 success)
> [75813.593628] EXT4-fs: mballoc: 1312 extents scanned, 438 goal hits, 1063 2^N hits, 0 breaks, 0 lost
> [75813.621386] EXT4-fs: mballoc: 1551 generated and it took 21437865
> [75813.640246] EXT4-fs: mballoc: 364104 preallocated, 204441 discarded
> [75813.685443] general protection fault: 0000 [#1] PREEMPT SMP
> [75813.698277] last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/enable
> [75813.698277] CPU 1
> [75813.698277] Modules linked in: btrfs/etc/init.d/halt zlib_deflate zlib_inflate crc32c libcrc32c radeon drm bridge stp llc bnep rf]
> .sh: line 90: 6[75813.698277] Pid: 6768, comm: umount Not tainted 2.6.30-rc1-crc #1 System Product Name
> 768 Segmentation[75813.698277] RIP: 0010:[<ffffffff8030e3a7>] [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
> fault umou[75813.698277] RSP: 0018:ffff8801466514a8 EFLAGS: 00010046
> nt "${x}" >&/dev[75813.698277] RAX: 0000000000000000 RBX: ffff880028066b40 RCX: ffff88015f3444a0
> /null
That's not supposed to happen. Do you have slab (or slub) debug
enabled?
-chris
> [75813.698277] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80847330
> [75813.698277] RBP: ffff8801466514e8 R08: 00000035c2309000 R09: 0000000000000002
> [75813.698277] R10: 0000000000001000 R11: 0000000000000001 R12: ff880153891480ff
> [75813.698277] R13: 0000000000000246 R14: ffffffff8088ca58 R15: 0000000000000080
> [75813.698277] FS: 00007f6dd9cc0740(0000) GS:ffff880028059000(0000) knlGS:0000000000000000
> [75813.698277] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [75813.698277] CR2: 00007f6dd964e000 CR3: 00000001425fd000 CR4: 00000000000006e0
> [75813.698277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [75813.698277] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [75813.698277] Process umount (pid: 6768, threadinfo ffff880146650000, task ffff88015f3444a0)
> [75813.698277] Stack:
> [75813.698277] 0000005000e7f0b0 0000000000e7f0b0 0000000000e7f0b0 0000000000000000
> [75813.698277] 0000000000000060 0000000000000051 ffff88013cd073c0 ffff88013cd078a0
> [75813.698277] ffff8801466515a8 ffffffffa04e1365 000000000000be2d 0000000000000000
> [75813.698277] Call Trace:
> [75813.698277] [<ffffffffa04e1365>] btrfs_update_delayed_ref+0x245/0x490 [btrfs]
> [75813.698277] [<ffffffff8043a8e0>] ? sort+0x160/0x250
> [75813.698277] [<ffffffffa048befc>] __btrfs_update_extent_ref+0x6c/0xb0 [btrfs]
> [75813.698277] [<ffffffff80610f94>] ? _cond_resched+0x44/0xa0
> [75813.698277] [<ffffffffa0491ab3>] btrfs_inc_ref+0x6c3/0x7d0 [btrfs][75813.698277] [<ffffffffa048e7bc>] ? btrfs_init_new_buffer+0x11c/0x180 [btrfs]
> [75813.698277] [<ffffffffa04c7b84>] ? write_extent_buffer+0x114/0x330 [btrfs]
> [75813.698277] [<ffffffffa048be90>] ? __btrfs_update_extent_ref+0x0/0xb0 [btrfs]
> [75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> [75813.698277] [<ffffffffa04815fa>] __btrfs_cow_block+0x58a/0xbc0 [btrfs]
> [75813.698277] [<ffffffffa0481d39>] btrfs_cow_block+0x109/0x270 [btrfs]
> [75813.698277] [<ffffffffa04877f2>] btrfs_search_slot+0x202/0x880 [btrfs]
> [75813.698277] [<ffffffffa048a458>] lookup_extent_backref+0x68/0x160 [btrfs]
> [75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> [75813.698277] [<ffffffffa048c91d>] __btrfs_free_extent+0x18d/0x950 [btrfs]
> [75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> [75813.698277] [<ffffffff80618191>] ? add_preempt_count+0x61/0x70
> [75813.698277] [<ffffffffa048d35d>] run_one_delayed_ref+0x27d/0x2c0 [btrfs]
> [75813.698277] [<ffffffffa048e8f6>] run_clustered_refs+0xd6/0x250 [btrfs]
> [75813.698277] [<ffffffffa048eb46>] btrfs_run_delayed_refs+0xd6/0x2b0 [btrfs]
> [75813.698277] [<ffffffffa04a4244>] btrfs_commit_tree_roots+0xb4/0x2f0 [btrfs]
> [75813.698277] [<ffffffffa04a4e0b>] btrfs_commit_transaction+0x5cb/0xa00 [btrfs]
> [75813.698277] [<ffffffff802724d0>] ? autoremove_wake_function+0x0/0x70
> [75813.698277] [<ffffffffa04a3315>] ? start_transaction+0x125/0x170 [btrfs]
> [75813.698277] [<ffffffffa047cd66>] btrfs_sync_fs+0x66/0xb0 [btrfs]
> [75813.698277] [<ffffffff803177a6>] __fsync_super+0x66/0xa0
> [75813.698277] [<ffffffff80317805>] fsync_super+0x25/0x50
> [75813.698277] [<ffffffff80317a7e>] generic_shutdown_super+0x3e/0x170
> [75813.698277] [<ffffffff80317c55>] kill_anon_super+0x25/0x70
> [75813.698277] [<ffffffff80318189>] deactivate_super+0x69/0xa0
> [75813.698277] [<ffffffff8033502c>] mntput_no_expire+0x1ac/0x1e0
> [75813.698277] [<ffffffff80335466>] sys_umount+0x76/0x3e0
> [75813.698277] [<ffffffff8020bf9b>] system_call_fastpath+0x16/0x1b
> [75813.698277] Code: 8b 9c c6 e8 00 00 00 48 83 3b 00 44 8b 7b 18 0f 84 77 01 00 00 31 d2 31 f6 48 c7 c7 30 73 84 80 e8 ff 2d fb ff
> [75813.698277] RIP [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
> [75813.698277] RSP <ffff8801466514a8>
> [75813.698277] ---[ end trace a92f79fb0023c3c1 ]---
>
> Followed by many more...
>
> Hope this helps,
> Ed Tomlinson
>
>
On Wednesday 08 April 2009 20:14:54 Chris Mason wrote:
> On Wed, 2009-04-08 at 19:48 -0400, Ed Tomlinson wrote:
>
> >
> > Chris,
> >
> > Just go the following gpf during shutdown runing 2.6.30-rc1 on amd64 on a kernel built with gcc 4.3.3
> >
> > * Unmounting filesystems ...[75813.573941] EXT4-fs: mballoc: 313285 blocks 3098 reqs (2001 success)
> > [75813.593628] EXT4-fs: mballoc: 1312 extents scanned, 438 goal hits, 1063 2^N hits, 0 breaks, 0 lost
> > [75813.621386] EXT4-fs: mballoc: 1551 generated and it took 21437865
> > [75813.640246] EXT4-fs: mballoc: 364104 preallocated, 204441 discarded
> > [75813.685443] general protection fault: 0000 [#1] PREEMPT SMP
> > [75813.698277] last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/enable
> > [75813.698277] CPU 1
> > [75813.698277] Modules linked in: btrfs/etc/init.d/halt zlib_deflate zlib_inflate crc32c libcrc32c radeon drm bridge stp llc bnep rf]
> > .sh: line 90: 6[75813.698277] Pid: 6768, comm: umount Not tainted 2.6.30-rc1-crc #1 System Product Name
> > 768 Segmentation[75813.698277] RIP: 0010:[<ffffffff8030e3a7>] [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
> > fault umou[75813.698277] RSP: 0018:ffff8801466514a8 EFLAGS: 00010046
> > nt "${x}" >&/dev[75813.698277] RAX: 0000000000000000 RBX: ffff880028066b40 RCX: ffff88015f3444a0
> > /null
>
> That's not supposed to happen. Do you have slab (or slub) debug
> enabled?
I am using slub without debugging enabled. I've attached my config incase it will help.
Ed
> -chris
>
> > [75813.698277] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80847330
> > [75813.698277] RBP: ffff8801466514e8 R08: 00000035c2309000 R09: 0000000000000002
> > [75813.698277] R10: 0000000000001000 R11: 0000000000000001 R12: ff880153891480ff
> > [75813.698277] R13: 0000000000000246 R14: ffffffff8088ca58 R15: 0000000000000080
> > [75813.698277] FS: 00007f6dd9cc0740(0000) GS:ffff880028059000(0000) knlGS:0000000000000000
> > [75813.698277] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > [75813.698277] CR2: 00007f6dd964e000 CR3: 00000001425fd000 CR4: 00000000000006e0
> > [75813.698277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [75813.698277] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > [75813.698277] Process umount (pid: 6768, threadinfo ffff880146650000, task ffff88015f3444a0)
> > [75813.698277] Stack:
> > [75813.698277] 0000005000e7f0b0 0000000000e7f0b0 0000000000e7f0b0 0000000000000000
> > [75813.698277] 0000000000000060 0000000000000051 ffff88013cd073c0 ffff88013cd078a0
> > [75813.698277] ffff8801466515a8 ffffffffa04e1365 000000000000be2d 0000000000000000
> > [75813.698277] Call Trace:
> > [75813.698277] [<ffffffffa04e1365>] btrfs_update_delayed_ref+0x245/0x490 [btrfs]
> > [75813.698277] [<ffffffff8043a8e0>] ? sort+0x160/0x250
> > [75813.698277] [<ffffffffa048befc>] __btrfs_update_extent_ref+0x6c/0xb0 [btrfs]
> > [75813.698277] [<ffffffff80610f94>] ? _cond_resched+0x44/0xa0
> > [75813.698277] [<ffffffffa0491ab3>] btrfs_inc_ref+0x6c3/0x7d0 [btrfs][75813.698277] [<ffffffffa048e7bc>] ? btrfs_init_new_buffer+0x11c/0x180 [btrfs]
> > [75813.698277] [<ffffffffa04c7b84>] ? write_extent_buffer+0x114/0x330 [btrfs]
> > [75813.698277] [<ffffffffa048be90>] ? __btrfs_update_extent_ref+0x0/0xb0 [btrfs]
> > [75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> > [75813.698277] [<ffffffffa04815fa>] __btrfs_cow_block+0x58a/0xbc0 [btrfs]
> > [75813.698277] [<ffffffffa0481d39>] btrfs_cow_block+0x109/0x270 [btrfs]
> > [75813.698277] [<ffffffffa04877f2>] btrfs_search_slot+0x202/0x880 [btrfs]
> > [75813.698277] [<ffffffffa048a458>] lookup_extent_backref+0x68/0x160 [btrfs]
> > [75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> > [75813.698277] [<ffffffffa048c91d>] __btrfs_free_extent+0x18d/0x950 [btrfs]
> > [75813.698277] [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> > [75813.698277] [<ffffffff80618191>] ? add_preempt_count+0x61/0x70
> > [75813.698277] [<ffffffffa048d35d>] run_one_delayed_ref+0x27d/0x2c0 [btrfs]
> > [75813.698277] [<ffffffffa048e8f6>] run_clustered_refs+0xd6/0x250 [btrfs]
> > [75813.698277] [<ffffffffa048eb46>] btrfs_run_delayed_refs+0xd6/0x2b0 [btrfs]
> > [75813.698277] [<ffffffffa04a4244>] btrfs_commit_tree_roots+0xb4/0x2f0 [btrfs]
> > [75813.698277] [<ffffffffa04a4e0b>] btrfs_commit_transaction+0x5cb/0xa00 [btrfs]
> > [75813.698277] [<ffffffff802724d0>] ? autoremove_wake_function+0x0/0x70
> > [75813.698277] [<ffffffffa04a3315>] ? start_transaction+0x125/0x170 [btrfs]
> > [75813.698277] [<ffffffffa047cd66>] btrfs_sync_fs+0x66/0xb0 [btrfs]
> > [75813.698277] [<ffffffff803177a6>] __fsync_super+0x66/0xa0
> > [75813.698277] [<ffffffff80317805>] fsync_super+0x25/0x50
> > [75813.698277] [<ffffffff80317a7e>] generic_shutdown_super+0x3e/0x170
> > [75813.698277] [<ffffffff80317c55>] kill_anon_super+0x25/0x70
> > [75813.698277] [<ffffffff80318189>] deactivate_super+0x69/0xa0
> > [75813.698277] [<ffffffff8033502c>] mntput_no_expire+0x1ac/0x1e0
> > [75813.698277] [<ffffffff80335466>] sys_umount+0x76/0x3e0
> > [75813.698277] [<ffffffff8020bf9b>] system_call_fastpath+0x16/0x1b
> > [75813.698277] Code: 8b 9c c6 e8 00 00 00 48 83 3b 00 44 8b 7b 18 0f 84 77 01 00 00 31 d2 31 f6 48 c7 c7 30 73 84 80 e8 ff 2d fb ff
> > [75813.698277] RIP [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
> > [75813.698277] RSP <ffff8801466514a8>
> > [75813.698277] ---[ end trace a92f79fb0023c3c1 ]---
> >
> > Followed by many more...
> >
> > Hope this helps,
> > Ed Tomlinson
> >
> >
>
>
>
On Wed, 2009-04-08 at 21:55 -0400, Ed Tomlinson wrote:
> On Wednesday 08 April 2009 20:14:54 Chris Mason wrote:
> > On Wed, 2009-04-08 at 19:48 -0400, Ed Tomlinson wrote:
> >
> > >
> > > Chris,
> > >
> > > Just go the following gpf during shutdown runing 2.6.30-rc1 on amd64 on a kernel built with gcc 4.3.3
> > >
> > > * Unmounting filesystems ...[75813.573941] EXT4-fs: mballoc: 313285 blocks 3098 reqs (2001 success)
> > > [75813.593628] EXT4-fs: mballoc: 1312 extents scanned, 438 goal hits, 1063 2^N hits, 0 breaks, 0 lost
> > > [75813.621386] EXT4-fs: mballoc: 1551 generated and it took 21437865
> > > [75813.640246] EXT4-fs: mballoc: 364104 preallocated, 204441 discarded
> > > [75813.685443] general protection fault: 0000 [#1] PREEMPT SMP
> > > [75813.698277] last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/enable
> > > [75813.698277] CPU 1
> > > [75813.698277] Modules linked in: btrfs/etc/init.d/halt zlib_deflate zlib_inflate crc32c libcrc32c radeon drm bridge stp llc bnep rf]
> > > .sh: line 90: 6[75813.698277] Pid: 6768, comm: umount Not tainted 2.6.30-rc1-crc #1 System Product Name
> > > 768 Segmentation[75813.698277] RIP: 0010:[<ffffffff8030e3a7>] [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
> > > fault umou[75813.698277] RSP: 0018:ffff8801466514a8 EFLAGS: 00010046
> > > nt "${x}" >&/dev[75813.698277] RAX: 0000000000000000 RBX: ffff880028066b40 RCX: ffff88015f3444a0
> > > /null
> >
> > That's not supposed to happen. Do you have slab (or slub) debug
> > enabled?
>
> I am using slub without debugging enabled. I've attached my config incase it will help.
>
Please enable slub debug, lets see what it turns up.
-chris